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@uitrit i .tutes datent fitte.

EDWIN GORDON, OF Bosroiv, MAssA-Onusiir'rs.l

Letters Patent No. 80,542,11ated August 4, 1868.

IMPROVB'D eHBMIcAL HRB-ENGINE.

TO ALL WHOM I'I MAY CONCERN:

Bc it known that I, EDWIN'GORDONWO Boston, in the county of Suffolk, and Commonwealth of Massachu' sctts, have'v invented certain new and useful Improvements in Chemical Fire-Engines; and I do hereby declare that the following is a full and exact description of the same.

The nature of my invention consists in constructing a chemical {ire-engine, divided into two compartments, having in each a chamber, through the centre of which passes the rod of the force-pump of the engine, having upon it a series of rings or cone-shaped disks; in dividing said chamber into tivo parts, the upper one of Iwhich shall have a bottom sloping towards the centre, so thatithe materials which these parts of the chambers are designed to hold shall have a tendency to slide towards the centre, through' which is an orifice for the passage of the pump-rod, with its rings or disks; in placing immediately below said upper part of the respective chambers an annular compartment sloping towards the centre, through whichthe pump-rod, with its rings or disks, passes, open at the centre, and communicating with a suction-pump by means of a suitable pipe; in attaching to each of said pump-rods, immediatelybelow said rings or disks, a cup-shaped sieve, which moves up and down with the pump-rod to which it is attached, er in placing 'a sieve having an opening for the passage ofthe pumprod in the lower part of said chambers respectively, and aiiixed to the sides of the same; in so placing in each of said compartments a suction-pump, to be worked by the pistons of the force-pumps of the engine respectively, that it shall furnish a regular supply ci'A pure water, capable Of graduation in the manner hereinafter shown; and in so placing a pipe, the lower part of which shall connect with the piston-chamber of said suction-pumps, and the upper part with an annular compartment placed around'the upper part of said chambers respectively, which is connected with said chambers by a series oi' perforations, that, by means of said pipe and annular compartment, Vwater canl be forced up from said piston-chamber by the same force which works the force-pumps of the engine, into saidvcompartment, andA thence supplied, should occasion require, to the upper part of said chambers. In the upper part of said pipes respectively is a thumb-cap, by means of which the water in this pipe can be supplied to or shut off from the said compartment, as may be required. 4

i The objects to be attained by this invention are, first, to furnish regularly, from chambers containing proper chemicalisubstances, such measured quantities of them -as are necessary to best generate the carbonio-acid gas with which the water to be expelled from the engine is to be charged, which quantities increase or diminish with the speed with which the engine is worked; secondly, to furnish regularly and uniformly a supply of pure water for the solution of such chemical substances, which supply of pure water also will depend upon the speed with which the engine is worked, increasing or diminishingwith it, and thus furnishing to the expelling-pumps of the engine a constant supply of the solutions for generatingcarbonio-acid gas in their proper' proportions and strength; and, thirdly,fby means of said pipe and thumb-cup, to furnish a supply of water to the upper parts of saiil chambers, so that a concentrated solution of such ,chemicals may be formed in the upper part of said chambers, and carried down by the grafluating-de.'ice, as above described, if it should bc deemed advisable.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and mode of operation.

Figure 1 is an external view of a 'chemical fire-engine embodying my improvements.

Figure 2 is a sectional view of the same. l

Each of the two compartments ot' the engine is precisely like the other, except that the upper part of the chamber A in onecompartmcnt contains one kind of chemical substance, and the similar part of the other part, another kind, the union of which substances, when in proper solution, forms the carbonio-acid gas with which the water to be expelled from the engine is to be charged; and the letters hereinafter used refer to the respective parts in both compartments.l p

A is a cylindrical chamber7 above the chamber of thc force-pump of the engine, and communicating; with it, the upper part of which is separated from the lower part by an annular compartment, I3, sloping towards the centre, through which is an orifice for the passage ofthe pump-rod, with its rings or disks. This compartment communicates with the suction-pump C, and is open in the'ecntrc. The oice of the upper portion. of the come chamber A, above the annular compartment, is to hold chemical substances for'generating carbonio-acid gas. Through the centre of the chamber Aplays the pump-rod D, having upon it a succession of ringsor conicalshaped disks, E. F is a cup-sliapcd sieve, which may be either fastened to the pump-rod D, and move up and down with it, or be fixed to the side of the` chamber A'. C is a suction-pump, for furnishing a regular supply of' pure water to the compartment B, by means of which compartment the water Hows around the entire circumference` of the rod D and the rings or disks E, and the'chemical substances carried down from the upper part of the chamber A. are washed down into thersieve F, where they are held suihciently .long to be completely dissolved or mingled with the water; and a regular supply of pure Water is furnishodfor the formation ofthe solutions to be used in the engines. a, is a pipe, communicating with the piston-chamber of the suction-pump C, having a valve, c, opening outwards, and a'thumb-cock d. e is an annular compartment, communicating with the pipe a, and with the upper part of the chamber A.

What I claim as my invention, and desire to secure-by Letters Patent, is'- v 1. The combination, in a chemical fire-engine, of chamber A, rod D, supplied with rings or conical-shaped disks'E, or other equivalent measuring or graduating-device, suction-pump C, compartment B, sieve F, pipe a, and compartment e, operating together substantially as and for the purposes explained. l

2. The combination, in a chemical dre-engine, of chamber A, rod D, supplied with rings, conical disks, or other measuringor graduating-device, suction-pump C, compartment B, and sieve F, operating together substantially as above described, and for the purposes above set forth. v

3. The combination, in a chemical fire-engine, of the upper part ot' the chamber A, or any equivalent, for holding chemical substances for generating carbonic-acid gas, with the pump-rod D, supplied with rings or disks, or any equivalent measuring or graduating-device, and the suction-.pump C, or any equivalent, for supplying a "graduated quantity of pure water, operating together substantially as above described, and for the purposes therein stated. g 4. The rod cfa force-pump or other expelling-pump of a chemical re-engin'e, so constructed that it shall extend above the piston-chamber of said pump, and have upon it a succession, of rings or conical disks 'or other equivalent measuring or graduatingdevice,`for carrying down from a chamber above, through which the rod travels, a definite and regular quantity of'some chemical substance orsubstancesl, for generating or assisting in generating carbonio-acid gas, substantially in the manner above speciied.

I 5. A suction-pump, so arranged that it shall furnish a regular measured supply of pure water proportionate to the amount of chemical substances used, and varying with the speed with 'which the engine is worked, for the purpose of dissolving and mixing with the chemical substances used for generating carbonio-acid gas in a chemical fire-engine, substantially in the manner and for the purpose specified above.

EDWIN GORDON.

Witnesses Oms. H. Dnnw, JOHN H. CRANDON. 

